When there is a showdown there are very many separate leaderboards . For example in the lowest level that is played in Paris room , you will see upwards of 5000 players available at any one time . So as each leaderboard only has 100 players , it stands to reason there are many competition leaderboards. This means you could find a score of say -10 winning one , but -15 winning another . So your opponents were as already said selected at random , but came from a separate competition leaderboard than the one you were in . So unfortunately unless you friend those players you will never know.